[exim] Understanding deny / require

Hi,

I am fiddling with some ACLs and I'm trying to decide whether to use
require or deny in certain situations.

For example, is:

require verify = sender

the same thing as:

   deny    !verify = sender

?


I now have:

   require verify        = sender
           log_message   = DENY - Sender verification failed

but this line is written for all messages that pass through, which is
not entire what I want, so I am considering to change this to:

   deny    !verify       = sender
           log_message   = DENY - Sender verification failed

Will this accomplish what I want?

Thank you,
Martijn.